Doug’s Headers D316 – 1 7/8″ 4-Tube Full Length Header Chevelle Big Block Chevrolet 68-74 Metallic Ceramic Coating

Headers – Full Length – 1.875 in Primary – 3.5 in Collector – Gaskets / Hardware Included – Steel – Ceramic – Big Block Chevy – GM F-Body 1970-81 – Pair

Doug’s Long Tube Header 70-81 GM F & A Body 396-502 BBC Non Cat, no EGR or A.I.R. 1 7/8″ Primary 3 1/2″ Collector Silver Ceramic Coated D316

Long tube headers provide the greatest increases in horsepower and torque across the entire RPM spectrum. The choice of racers worldwide, Doug’s long tube headers are designed for the car owner who wants maximum power and the highest quality header on the market.This fitment is tailored for popular aftermarket engine swap kits. Doug’s engine swap headers were developed to solve common fitment issues in tight spaces, making your swap process smoother. No more guesswork or modifications needed – just straightforward installations that save you time and frustration.

• 3/8″ Thick machined flanges to prevent warping
• Precision formed long transition collectors and long tube design reduces backpressure and increases higher RPM horsepower
• Heavy duty 16-gauge tubing for long life
• Tubes are pre-polished to removed scratches before applying metallic ceramic or hi-temp black coating

Collector Attachment: 3-Bolt FlangeCollector Diameter: 3.5Collector Port Diameter: 3.5Color: SilverCylinder Head Port Shape: SAPDesign: Full-lengthEGT Port: NoEmissionFullDES: 3 – This Product is LEGAL for Closed Course Competition use or Pre-Emissions Controlled Vehicles ONLY. It is Not Legal for use on any Emissions Controlled Vehicle for Street or Off Highway use.Finish: Metallic Ceramic CoatedFlange Thickness: 0.375Gasket Or Seal Included: YesGaskets Included: YesGrade Type: PerformanceHeader Material: SteelHeader Style: Full-lengthMaterial: SteelMounting Hardware Included: YesOxygen Sensor Port: NoPort Shape: RoundPrimary Tube Outside Diameter: 1.875Primary Tubing Diameter: 1.875Sheen Level: Semi-GlossTube Wall Thickness: 16